Hi!
A couple of weeks ago, my '04 Gallardo started blowing ambient air (went from blowing cold air the week before to ambient the following week). I can't find any leaks underneath the car. I jacked up the car and used a pressure gauge to check the compressor pressure (while idling). The pressure showed good, (actually a little high). The compressor does cycle (I get a drop in RPM when the compressor is off, and a rise in RPM when I deselect the A/C). I did notice that my passenger side radiator fan was not coming on when the A/C was turned on. I changed the 50A fuse discussed in other threads with a new one; did not change anything. I drove the car last weekend, and noticed that the fan does come on when the car got hot, so it is working, but it still blew ambient air. When I go full hot the car does blows HOT air, so I'm thinking that eliminates the heater control valve. I have used some old posts, and not all of my symptoms add up to a heater control valve or pressure sensor. I'd very much appreciate any help.
Symptoms:
- Blows ambient air through all vents
- All vents blow air
- When switched to full hot, car will blow significantly hotter air
- compressor seems to engage
- A/C Fluid pressure good
- Passenger side radiator fan does not come on when A/C engaged
- Changed 50A fuse with no change in symptoms
- Passenger side radiator fan comes on when car gets hot, so it does work
- Have not changed HCV or Pressure sensor